/Engine/Plugins/Experimental/DefaultInstallBundleManager/Source/Public/DefaultInstallBundleManager.h
virtual EInstallBundleResult FlushCache ( FInstallBundleSourceOrCache SourceOrCache, FInstallBundleManagerFlushCacheCompleteDelegate Callback, [ELogVerbosity::Type](API\Runtime\Core\Logging\ELogVerbosity__Type) LogVerbosityOverride )